JP3735993B2 - Oil cooler - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oil cooler having a water-cooled heat exchanger that is disposed between an internal combustion engine side and an oil filter and cools lubricating oil that lubricates the internal combustion engine with cooling water.
[0002]
[Prior art]
Conventionally, as prior art documents related to an oil cooler, those disclosed in Japanese Utility Model Laid-Open No. 5-47340 are known. In this technology, in addition to the lubricating oil passage, a cooling water passage is also integrally formed in the cylinder block of the internal combustion engine, thereby eliminating the external piping for the cooling water of the oil cooler and simplifying the assembly work. ing.
[0003]
[Problems to be solved by the invention]
By the way, since the temperature of the lubricating oil flowing from the internal combustion engine side to the oil cooler becomes a high temperature of about 140 to 150 ° C. depending on conditions, it corresponds to an O-ring (seal member) that comes into contact with the lubricating oil and partitions an area such as a passage. Temperature resistance characteristics are required. In addition, since the oil cooler is not normally removed after being mounted on the vehicle, the O-ring disposed between the internal combustion engine side and the oil cooler is required to have the same life as the vehicle. For this reason, the O-ring is limited to those made of a material having high temperature resistance characteristics and little change with time, and there is a problem that it becomes expensive.
[0004]
Therefore, the present invention has been made to solve such a problem, and particularly relates to an oil cooler disposed between the internal combustion engine side and the oil filter. In particular, the piping layout is simplified, and the reliability of the seal is low. The challenge is to provide an oil cooler with improved performance.
[0005]
[Means for Solving the Problems]
According to the oil cooler of the first aspect, the first seal member is disposed so as to surround the passage of the lubricating oil provided substantially at the center of the mounting substrate, and the second seal member is provided so as to surround the passage of the cooling water provided around the first seal member. The sealing member is arranged. For this reason, the first sealing member that partitions the lubricating oil and the cooling water is exposed to the high temperature of the lubricating oil on the inner peripheral side, but is cooled with the cooling water on the outer peripheral side. As a result, a material having low temperature resistance characteristics is formed. A material that can be selected and has little change with time can be selected. As a result, an oil cooler that is inexpensive and has improved seal reliability can be configured. Further, two rings made of concentric circles are arranged as the second seal member around the first seal member arranged on the mounting substrate, and are divided by the first seal member and the second seal member. The cooling water inlet-side passage and the outlet-side passage are separately provided in the shape-shaped region, so that there is no need to align each passage in the rotational direction when the oil cooler is disposed on the internal combustion engine side. can get.
[0007]
In the oil cooler according to claim 2, the mounting substrate is fixed to the internal combustion engine side by a hollow penetrating mounting member that forms a lubricating oil outlet side passage in the lubricating oil passage. The effect that can be made compact is obtained.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples.
[0009]
FIG. 1 is a cross-sectional view showing a use state of an oil cooler according to an example of an embodiment of the present invention. 2 is a plan view of the oil cooler along the line AA in FIG. 1, and FIG. 3 is a plan view of the bracket along the line BB in FIG.
[0010]
1, 2, and 3, a bracket 10 is fixed to an internal combustion engine (not shown), and a water-cooled oil cooler is provided through a hollow through bolt 40 as a mounting member screwed to the bracket 10. 20 is inserted and fixed with a nut 48. A known spin-on type oil filter 50 is liquid-tightly attached to the oil cooler 20 via the gasket 53 by using the male thread portion 41 on the distal end side of the hollow through bolt 40. As described above, the oil cooler 20 is disposed between the bracket 10 on the internal combustion engine side and the oil filter 50.
[0011]
Near the center of the bracket 10 is an oil inlet side passage 11 which is oil as lubricating oil for lubricating the internal combustion engine, and sends out dirty oil from the internal combustion engine side to the oil filter 50 side through the oil cooler 20. An oil outlet side passage 12 for returning the purified oil, after the dirty oil is filtered by the oil filter 50, to the internal combustion engine side via the oil cooler 20, and an oil bypass passage 13 are formed. Further, around the bracket 10, a cooling water inlet side passage 15 that sends cooling water from the internal combustion engine side to the oil cooler 20 side, and a cooling water outlet side passage that returns the cooling water from the oil cooler 20 side to the internal combustion engine side. 16 is formed (see FIGS. 1 and 3).
[0012]
The oil cooler 20 has a substantially cylindrical shape formed by joining housing members 22, 23, and 24 on a base plate 21 as a mounting substrate. Among them, a cooler core 30 having a disk-like structure laminated (seven layers in FIG. 1) is disposed in an internal space surrounded by the base plate 21 and the housing member 22 as will be described later. In addition, cooling water flows outside the cooler core 30, and oil (purified oil) flows inside the cooler core 30. In addition, oil (dirty oil) flows through an oil passage 31 provided so as to pass through the cooler core 30 in an internal space surrounded by the upper and outer surfaces of the housing member 22 of the oil cooler 20 and the housing members 23 and 24. , And sent to the oil filter 50 side. Here, a mounting surface for mounting the oil filter 50 via the gasket 53 is formed on the upper and outer surfaces of the housing member 24 joined to the housing member 23 of the oil cooler 20.
[0013]
An O-ring 25 that is held by the holding plate 26 and seals the contact surface with the hollow through bolt 40 in a liquid-tight manner on the mounting seat 21a side of the base plate 21 of the cooler core 30 that is in close contact with the bracket 10 on the internal combustion engine side. An O-ring 27 as a first seal member that partitions oil (dirty oil) and cooling water that cools the oil, and an O-ring as a second seal member that partitions the outer edge of the base plate 21 on the mounting seat 21a side 28 are arranged concentrically (see FIGS. 1 and 2). Furthermore, as shown in FIG. 2, the base plate 21 is formed with a groove 21e through which cooling water can pass over the entire circumference between an O-ring 27 and an O-ring 28 arranged concentrically.
[0014]
As shown in FIG. 1, the hollow through bolt 40 is screwed and fixed to the bracket 10, and penetrates almost the center in the axial direction so that the oil outlet side passages 42 and 45 are drilled through the orifice 46. It is installed. In the vicinity of the orifice 46 of the oil outlet side passage 42, there are a plurality of upper horizontal holes 43 for flowing oil (purified oil) to the cooler core 30 side of the oil cooler 20, and in the vicinity of the orifice 46 of the oil outlet side passage 45, the oil cooler 20. A plurality of lower horizontal holes 44 for allowing oil (purified oil) from the cooler core 30 side to flow into the oil outlet side passage 45 are formed. An oil bypass passage 47 is formed in the hollow through bolt 40 in parallel with the oil outlet side passages 42 and 45.
[0015]
Next, each flow of oil and cooling water will be described with reference to FIG.
[0016]
Dirty oil from the internal combustion engine side is oil provided from the oil inlet side passage 11 of the bracket 10 to the oil passage 26a of the holding plate 26 and the base plate 21 of the oil cooler 20 as shown by solid arrows in FIG. The oil is fed to the oil filter 50 side through an inlet passage 21b and an oil passage 31 provided so as to penetrate the cooler core 30. The dirty oil is filtered through the upper filter element 51 in the oil filter 50 to obtain purified oil, and then passes through the oil outlet side passage 42 in the hollow through bolt 40. The hollow through bolt 40 is introduced into the cooler core 30 in the oil cooler 20 through the upper horizontal hole 43 formed in the hollow through bolt 40.
[0017]
The purified oil that has passed through the cooler core 30 passes from the lower lateral hole 44 formed in the hollow through bolt 40 through the oil outlet side passage 45 in the hollow through bolt 40 to the internal combustion engine side from the oil outlet side passage 12 of the bracket 10. Returned. A part of the purified oil passing through the oil outlet side passage 42 in the hollow through bolt 40 passes through the cooler core 30 through the orifice 46 provided in the middle without flowing to the cooler core 30 side. Combined with oil. The oil filter 50 shown in FIG. 1 is for a diesel engine, and the purified oil filtered to fine carbon particles by the lower filter element 52 in the oil filter 50 is drilled in the hollow through bolt 40. It returns to the internal combustion engine side from the oil bypass passage 13 of the bracket 10 through the oil bypass passage 47.
[0018]
On the other hand, the cooling water from the internal combustion engine side is, as indicated by broken arrows in FIG. 1, from the cooling water inlet side passage 15 of the bracket 10 to the cooling water inlet side passage 21 c provided in the base plate 21 of the oil cooler 20. After passing through the outside of the cooler core 30, it passes through the cooling water outlet side passage 21 d provided in the base plate 21 and is returned from the cooling water outlet side passage 16 of the bracket 10 to the internal combustion engine side.
[0019]
In this way, heat exchange is performed between the cooling water flowing outside the cooler core 30 in the oil cooler 20 and the oil flowing inside the cooler core 30, and the temperature of the oil is lowered. In addition, a groove 21e is formed in the base plate 21, and a part of the cooling water flows through the groove 21e to the cooling water outlet side passage 21d side without passing through the cooling water inlet side passage 21c of the base plate 21. It will be. Thereby, even when the temperature of the oil flowing inside the O-ring 27 arranged on the base plate 21 is high, the cooling water flows outside the O-ring 27. The influence received can be reduced.
[0020]
Thus, the oil cooler 20 of the present embodiment is disposed between the internal combustion engine side and the oil filter 50, and the cooler core 30 as a water-cooled heat exchanger that cools the oil that lubricates the internal combustion engine with the cooling water. The oil inlet side passage 21b and the oil outlet side passage 45 are provided so as to allow oil to pass through substantially the center of the base plate 21 serving as a mounting board for the internal combustion engine, and cooling water is passed through the periphery thereof. The cooling water inlet-side passage 21c and the cooling water outlet-side passage 21d, and the oil inlet-side passage 21b and the oil outlet-side passage 45 in the base plate 21 are disposed so as to partition the oil and the cooling water. A second seal member that surrounds the O-ring 27 as a sealing member, the cooling water inlet side passage 21c and the cooling water outlet side passage 21d and is disposed at the outer edge of the base plate 21. Those comprising the O-ring 28.
[0021]
Accordingly, the O-ring 27 as the first seal member is disposed so as to surround the oil inlet side passage 21b and the oil outlet side passage 45 provided in the approximate center of the base plate 21, and the cooling water inlet side provided in the periphery thereof. An O-ring 28 as a second seal member is disposed so as to surround the passage 21c and the coolant outlet side passage 21d.
[0022]
For this reason, the O-ring 27 that separates the oil and the cooling water is exposed to the high temperature of the oil on the inner peripheral side, but is cooled with the cooling water on the outer peripheral side. As a result, a material having low temperature resistance characteristics can be selected. In addition, it is possible to select a material with little change with time. Thereby, the oil cooler 20 which is inexpensive and has improved seal reliability can be configured.
[0023]
The oil cooler 20 of the present embodiment fixes a base plate 21 as a mounting substrate to the internal combustion engine side, and an oil outlet side passage among the inlet side passage and the outlet side passage of oil and cooling water in the base plate 21. The hollow through-bolt 40 is provided as a hollow through-shaped mounting member that forms 45. That is, according to the hollow through bolt 40, the space for fixing the oil cooler 20 to the internal combustion engine side and the space for the oil outlet side passage 45 can be combined. For this reason, the radial direction of the oil cooler 20 can be made small and compact.
[0024]
Next, an oil cooler 20 ', which is a modification of the above-described embodiment, will be described with reference to FIG. In the oil cooler 20 'of the present embodiment, only the plan view of FIG. 4 corresponding to FIG. 2 is shown. Shown with a symbol. The other configurations are the same and will not be described.
[0025]
In FIG. 4, the difference from the above-described embodiment is that the position of the cooling water inlet side passage 21c or the cooling water outlet side passage 21d provided in the base plate 21 'as the mounting substrate is changed in the radial direction. Corresponding to this position change, an O-ring 29a surrounding the cooling water inlet-side passage 21c and a cooling water outlet-side passage 21d provided on the outer periphery of the O-ring 29a are enclosed at the outer edge of the base plate 21 '. Two bodies made of concentric circles with the arranged O-ring 29b are used as the second seal member. Then, a groove portion 21f filled with cooling water is formed between the O-ring 27 and the O-ring 29a arranged concentrically on the base plate 21 ', and the O-ring 29a and the O-ring arranged concentrically. A groove portion 21g that is filled with cooling water is formed around 29b.
[0026]
For this reason, the cooling water filled in the groove portion 21f is cooled by the cooling water passing through the cooling water inlet side passage 21c of the base plate 21 ', and the groove portion 21g is filled by the cooling water passing through the cooling water outlet side passage 21d. The cooling water will be cooled. As a result, even when the temperature of the oil flowing inside the O-ring 27 arranged on the base plate 21 'is high, the outside of the O-ring 27 is filled with cooled cooling water. The influence which the O-ring 27 receives can be reduced.
[0027]
As described above, the oil cooler 20 'according to the present embodiment is composed of two concentric circles as the second seal member around the O-ring 27 as the first seal member disposed on the base plate 21' as the mounting substrate. The O-rings 29a and 29b are provided, and the cooling water inlet side passage 21c and the cooling water outlet side passage 21d are separately provided in two ring-shaped regions partitioned by the O ring 27 and the O rings 29a and 29b. It is.
[0028]
For this reason, the second seal member has two O-rings 29a and 29b, and the radial dimension of the oil cooler 20 'tends to increase by that amount, but the oil cooler 20' is disposed on the internal combustion engine side. It is not necessary to align the passages in the rotational direction. As a result, as in the oil filter 50 mounting structure shown in FIG. 1, the oil cooler 20 'can be rotated with respect to the internal combustion engine side and fixed with an appropriate torque to complete the installation. it can.
[0029]
By the way, although the oil cooler of the said Example was formed in the substantially cylindrical shape, when implementing this invention, it is not limited to this, If it is not a spin-on type mounting structure, it will be various. The first seal member arranged by partitioning the oil and the cooling water can be cooled by cooling water having a generally low temperature with respect to the oil. As a result, a cheaper material can be selected as the material of the first seal member, and a material with little change over time can be selected, so that the reliability of the seal can be improved.
[0030]
Further, in the above embodiment, the O-ring is illustrated as a concentric circle with a single circular shape, but a plurality of O-rings arranged concentrically are arranged at an appropriate angular position in the radial direction in the O-ring seal cross section. By connecting more narrowly, it is possible to make one O-ring integral while ensuring the passage of cooling water. Thereby, handling of an O-ring can be made easy and an assembly man-hour can also be reduced.
[0031]
In the above embodiment, the oil cooler is connected to the internal combustion engine side via the bracket, but the oil cooler may be directly connected to the cylinder block of the internal combustion engine.
[0032]
Further, in the above embodiment, the O-ring 25 is configured to surround both the oil inlet side passage 21b and the oil outlet side passages 42 and 45. However, the O ring 25 surrounds only one of both passages, for example, the other You may connect through the piping provided separately. Similarly, only one of the coolant inlet side passage 21 c and the coolant outlet side passage 21 d may be connected by a pipe connected to the side surface of the oil cooler 20. Even in these configurations, it is possible to reduce the number of pipes and cool the O-ring.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a usage state of an oil cooler according to an example of an embodiment of the present invention.
FIG. 2 is a plan view of the oil cooler along the line AA in FIG.
FIG. 3 is a plan view of the bracket taken along the line BB in FIG. 1;
FIG. 4 is a plan view showing a modified example of the arrangement of the O-ring corresponding to the position change of the inlet side passage and the outlet side passage of the cooling water in the oil cooler according to an example of the embodiment of the present invention. is there.
[Explanation of symbols]
10 Bracket 20 Oil cooler 21 Base plate (mounting board)
21a Mounting seat 21b Oil inlet side passage 21c Cooling water inlet side passage 21d Cooling water outlet side passage 25 O-ring 27 O-ring (first seal member)
28 O-ring (second seal member)
30 Cooler core (heat exchanger)
40 Hollow through bolt (Mounting member)
42, 45 Oil outlet side passage 50 Oil filter

Claims (2)

An oil cooler having a water-cooled heat exchanger disposed between an internal combustion engine side and an oil filter for cooling the lubricating oil for lubricating the internal combustion engine with cooling water,
Respective passages provided so as to allow the lubricating oil to pass through substantially the center of the mounting substrate to the internal combustion engine side and the cooling water to pass therearound,
A first seal member disposed so as to surround the lubricating oil passage in the mounting substrate and partition the lubricating oil and the cooling water;
A second seal member that surrounds the cooling water passage and is disposed at an outer edge of the mounting substrate ;
The second seal member is disposed as two concentric circles around the first seal member disposed on the mounting substrate, and is partitioned by the first seal member and the second seal member. oil cooler, characterized in Rukoto separately provided inlet-side passage and the outlet side passage of the cooling water to the two ring-shaped area. Claims, characterized in that to fix the mounting substrate to the internal combustion engine side, comprises a hollow through-shaped attachment member forming the outlet passage of the lubricating oil of the lubricating oil passage in said mounting substrate The oil cooler according to 1 .

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